Illinois Election Code. - 10 ILCS 5, Section 29C-5
Three Groups of Legislative Districts. The 59 legislative districts of this State are divided into 3 groups for the purpose of establishing the terms...
Illinois Election Code. - 10 ILCS 5, Section 29C-15
Determination of groups. To determine which group of Legislative Districts shall be the "First group", "Second group", or "Third group" for the purpose of establishing...